Snatch-block



(Model.)

T. R. FERRALL.

Snatch Block. No. 243,034.-

Patented June 14,1881.,

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VUNITED STATES PATENT OFFICE.

THOMASR. FERRALL, OF BOSTON, MASSACHUSETTS.

SPECIFICATION forming part of Letters Patent No. 243,034, dated June 14,1881.

Application nien May 16,1881. (Model.)

To all whom it may concern:

Be it known that I, THOMAS R. FERRALL, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Snatch-Blocks, of which the following is a full, clear,and exact description.

This invention relates to improvements in the snatch-blocks for whichLetters Patent No. 235,222 were issued to me on the 7th day of December,A. D. 1880. In this patent the cheek-pieces are composed of hollowcast-metal frames with rounded edges, and the pivoted pin of theswiveled hook extends through one cheek-piece and through a metal strappassing centrally through the said cheek, while the loop or link forembracing and holding the other end of the pivoted pin of the swiveledhook is hinged or journaled in a metal strap extending centrally throughthe other cheekpiece, said metal straps being solely sustained by theaxial pin of the sheave-pulley.

The objects of my present invention are to render such snatch-blocksless expensive of production, to lessen their weight, to maintain thevery desirable feature of the pivoted hook and the hinged retaining loopor link, and to firmly sustain and hold the cheek-pieces in parallelposition by a transverse pin or bolt at the lower end of thesnatch-block. These objects I accomplish by the structure ofsnatch-block illustrated in the accompanying drawings, in which- Figurel represents a perspective view of a snatch-block constructed accordingto my invention, with the pivoted pin of the swiveled hook engaged bythe hinged loop or link; Fig. 2, a perspective view of the same, withthe parts in position to admit the rope into the snatch or opening; Fig.3, a vertical central sectional view.

Referring to the drawings, the letters A B indicate two woodencheek-pieces, preferably formed of a single piece of vwell-Seasoned ashor other suitable wood.

The wooden cheek-piece A is embraced on its inner and outer faces withlongitudinal metal straps a a, which project beyond the upper edges ofthe wooden cheek, and their extended ends are joined or united so as toform a seater bearing, b, in which 1s hinged or journaled a link orloop, C, which rests on the upper edge of the wooden cheek, and isconfined in position by the connected or united ends of the metal strapsa a. These straps can be made of a single piece of metal doubled uponitself so as to embrace the inside and outside faces of the woodencheek, and theinside inet-al strap terminates at a short distance fromthe lower end ofthe wooden cheek, as at c, so as to avoid cutting awaythe lower portion of the cheek; or the said inner strap may extend tothe lower edge of the cheek, the same as the outer cheek. i

The Wooden cheek-piece B is somewhat longer than the other cheek, A, andis embraced and clasped on its inside and outside faces by the metalstraps d d, the uppergends of which project beyond the cheek to form anextension, which is perforated to receive one end of the pivoted pin fofthe swiveled hook g. The inner strap d terminates a short distance fromthe lower edge of the cheek B, as at c', similar to the inner strap a,-or it may extend to the lower edge of said cheek. The straps d d arepreferably formed of two separate pieces of metal, welded together attheir upper ends, which virtually constitute a single piece, with twoarms which embrace the cheek.

The Wooden cheek-pieces at their lower ends are spaced by an interposedblock, h, preferably of wood, for lightness and economy, and the outsidemetal straps, together with the cheeks, are sustained and braced inparallel position with relation to each other by means ot' a transversepin or bolt, t'.

The pivoted pin fof the swiveled hook is bent, or extends at rightangles therefrom, forming the laterally-projecting arm or lip lc, andthe other end ofthe pivoted pin is adapted to freely turn in its socketor bearing in the extension of the metal straps d.

When it is desirable to place the bght of the rope in the snatch-blockthe hook g is turned down into the position shown in Fig.2, which bringsthe arm or lip la into coincidence with ,the opening of the loop or linkC, when the lat- .ter can be swung over and away from the arm or lip,leaving the snatch or opening free for the insertion of the rope. Afterthe rope is passed through the snatch or opening the link IOO or loop Cis swung back over the arm or lip k,

and the hook g is turned to its normal position, as shown in Fig. 1,thus securely connecting the parts.

The metal straps and the wooden cheeks are provided with coincidentapertures for receiving the axial pin Z of the sheave-pulley m, and thisaxial pin subserves the function of further strengthening and supportingthe straps and cheek-pieces.

A snatch-block constructed as hereinbefore described provides lightnesswith increased strength in the structure, and at the same time securesthe very desirable features of the pivoted hook and the retaining loopor link.

The metal straps are each set within a vertical recess in the oppositefaces of the wooden cheeks, in order to cause said straps to set in Hushwith the faces of the cheeks, and by terminating the inside straps abovethe lower edges of the wooden cheeks I avoid cutting away such lowerportions on their inner faces, and thereby impart strength to thestructure.

I do not here claim, broadly, a snatch or pulley block consisting ofwooden cheek-pieces embraced by inner and outer longitudinal metalstraps, all connected at their lower ends by a transverse pin, and theupper-end portions of the straps being extended beyond the upper edge ofthe wooden cheek-pieces to form extensions, which are provided withdevices to suspend the snatch or pulley block, as such structure ofitself forms the subject-matter of a separate application for LettersPatent heretofore led by me.

short distance from the lower edge of the cheeks to avoid cutting awaythe latter, and the outer straps only connected at their lower ends by atransverse pin, the upper ends of the said metal straps being extendedand joined beyond the upper edges of the cheeks, and provided,respectively, with the journaled loop or link, and the pivot-ed pinhaving the arm or lip, and the swiveled hook, substantially asdescribed.

2. A snatch-block consisting of theinner and outer metal straps, eachformed integral, and embracing the inside and outside laces of twowooden cheek-pieces, the lower ends of' the outside straps beingconnected by the transverse pin, and the upper ends of the straps beingextended beyond the upper edges ot' the Wooden cheek-pieces, one of saidstra-ps being provided with a loop or link for opening and closing thesnatch, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

THOMAS R. FERRALL.

Witnesses:

EDWIN W. BROWN, WM. S. BELLows.

